American Heritage Dictionary
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Century Dictionary
GNU Webster's 1913
WordNet
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Elsewhere on the web
The proper way to drain it is to open up the petcock and let it flush.
Then open the pressure relief valve at the top of the tank and open the petcock and let it flush itself out.
Per the install instructions, I installed a safety shut-off petcock (sp?) in the supply line.— Southern Maryland Community Forums
One crawled in and settled down, and turned the petcock that inflated the cover.— Space Tug
They were fitted with a dial gauge, a vent port in the form of a petcock or counterweight, and a safety fuse. are lightweight, thin-walled kettles; most have turn-on lids.— ReadABlog.com New Blogs and RSS Feeds

American Heritage Dictionary (1)
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